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I think Active Automotive's dyno and track results even reflect the "perfect" sizing of the LSA 1900 blower.

They made 736.7rwhp with the LSA (Green Line)
And 832rwhp with the 2.9L whipple (Red Line)

Now the rotors on the whipple are bigger in size but brings back into question more rotational mass.

The LSA blower on this dyno is showing roughly 600rwhp at 4000rpm and the whipple only 390rwhp thats a massive 210rwhp win to the LSA blower.

Not only that it's not until 5500rpm that the whipple actually starts to make more HP and TQ than the LSA blower.

With the correct tire combo, more tuning on the LSA blower it could easily beat the whipple at the track and it nearly did, the whipple went 9.8 on a different day and the LSA went 9.9...hell maybe if they had the exact same track conditions they would have both run 9.8sec.

Now put yourself in the shoes of owning a GTS already fitted with an LSA blower and you spend what 15k and thats the only result you get from it?....hardly worth it.

The LSA blower is perfectly suited to this sized engine, it's not a dyno queen blower but it is a bloody fast one at the track.

I'm after big power, not interested in what it can do changing tyres and whatever else to race it so the Whipple looks like a good choice to me. Were both superchargers making the same boost? The torque curves don't look very flat for supercharged motors from what I have seen.
I might have to talk to Harrop about their 2650 but a 2.9 Whipple looks good

But are they the same boost? The Whipple may not be working very hard but the LSA may be maxed out. I want as much HP as I can get. Maybe 1000 at the wheels if the engine can handle it. Then again, I may need a stroker bottom end

But are they the same boost? The Whipple may not be working very hard but the LSA may be maxed out. I want as much HP as I can get. Maybe 1000 at the wheels if the engine can handle it. Then again, I may need a stroker bottom end

My old tuners good engine was getting a rebuild and he still wanted to go to the drags so he stuck his dirty big turbo on a stock Ls1, dropped it into his VN and was pulling 8s.. Superchargers are so un-economical compared to a turbo